COMPARATIVE RESPONSES OF PHENOLOGY AND REPRODUCTIVE DEVELOPMENT TO SIMULATED ENVIRONMENTAL-CHANGE IN SUB-ARCTIC AND HIGH ARCTIC PLANTS

The effects of temperature, precipitation and nutrient perturbations, and their interactions, are being assessed on two contrasting arctic ecosystems to simulate impacts of climate change. One, a high arctic polar semi-desert community, is characterised by a sparse, low and aggregated vegetation cover where plant proliferation is by seedlings, whereas the other, a sub-arctic dwarf shrub heath, is characterised by a complete vegetation cover of erect, clonal dwarf shrubs which spread vegetatively. The developmental processes of seed production were shown to be highly sensitive, even within one growing season, to specific environmental perturbations which differed between sites

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